27" iMac GPU heat (late 2012)

Discussion in 'iMac' started by Dykstra, May 22, 2013.

  1. Dykstra macrumors newbie

    Apr 19, 2013
    I just got my new iMac delivered and gave it a quick test. I loaded up World of Warcraft, literally walked around for 2 minutes and checked the temperatures of my GPU and CPU. The CPU was around 80c and the GPU was 91c. That surely isn't right? I mean if thats the temps for a fairly undemanding game after doing nothing more than walking around for a few minutes, there must be a problem?
  2. WilliamG macrumors G3

    Mar 29, 2008
    That doesn't sound unreasonable to me. I hit 85C on the GPU playing NFS: Most Wanted in Windows 7 on my 2012 iMac (680GTX), and 87C with an overclock.
  3. Outrigger macrumors 68000


    Dec 22, 2008
    sounds perfectly normal. temps can shoot up or down in a matter of seconds.
  4. Mr. Retrofire macrumors 601

    Mr. Retrofire

    Mar 2, 2010
    Everything around 100 °C is perfectly normal for Ivy Bridge processors (Desktop/Mobile). And do me a favor, do not check the GPU/CPU temps! Thank you very much! This is really useless, especially with Turbo Boost 2.0 or newer.
  5. TheEasterBunny macrumors 6502

    Jan 22, 2013
    Heat dissipation is one of those things the iMac design does not do very well. The form factor just doesn't allow heat to escape very well. While it is true that Ivy Bridge processors run hot, the combo of the iMac form factor and such a hot chip, means a pretty little space heater.
  6. Dykstra thread starter macrumors newbie

    Apr 19, 2013
    Sorry guys, but I don't think 90 degrees is normal after 2 minutes of usage, let alone 2 hours of usage, unless you're seriously overlocking your card. 75-80 tops after a long session is sensible.
  7. iSayuSay macrumors 68030


    Feb 6, 2011
    Try rev up the fans and see if things get better.
  8. WilliamG macrumors G3

    Mar 29, 2008
    Actually, it makes perfect sense. But if you want to return your iMac and not listen to anyone here, you're more than welcome to. :p

    Again, this is an all-in-one system. The temperature of some of the components can get warm, so hitting 91C in 2 minutes is NOT unusual at all. I hit 87C in Need for Speed Most Wanted in under 60 seconds of gameplay in Boot Camp on my iMac, so I'm not sure how you've decided that "75-80 tops after a long session is sensible." The iMac wasn't designed around what Dykstra thinks is sensible. :D

    So again, return the iMac if it doesn't behave like you want it to. But the reality of it + gaming is what you're experiencing. I'm not even entirely sure what's bothering you...
  9. apedance macrumors member

    Sep 1, 2012
    My Late 2012 iMac has a i7 Quad with Turboboost! (works on every Turboboost'ed Intel CPU)

    The CPU is fast enough. Why not disable Turboboost to safe energy and reduce heat.

    When in Windows:

    In control panel -> Power Options -> Edit power plan -> Change advanced power settings -> Processor power management -> Maximum processor state. I set it to <100%. (use 99 %)

    Also affects the GPU "a bit"

  10. Mac32 Suspended

    Nov 20, 2010
    I have never hit 91C, even with fairly aggressive GPU overclocking, and I game for several hours at a time. So, it should not be necessary to have those high temperatures , just turn off turbo boost, and set a static higher fanspeed while gaming (1800-2500rpm depending on the game).
  11. The-Pro macrumors 65816

    Dec 2, 2010
    Its possible that the fans just hadnt spun up when you checked the temperature. 5 minutes later it might have been different. I dont know.
    Also some games, even undemanding ones use the GPU to 100% so the heat produced is the same to a game that is demanding and also used the GPU to the max.
  12. PJM82 macrumors member


    Apr 28, 2013
    United Kingdom
    Also don't forget your temps are greatly influenced by the ambient temperature. If your rooms hot, the PC/iMac will run hot.
  13. Macsonic macrumors 65816


    Sep 6, 2009
    It may also be that video intense apps induces more heat since the GPU has to work harder.

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